[FFmpeg-trac] #1223(undetermined:new): Problem with .ass subtitles

[FFmpeg]

#1223: Problem with .ass subtitles
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             Reporter:  saito1234    |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  ass          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
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Comment (by saito1234):

 Well, you're right, I can't upload the source file here because it's too
 big, I've muxed this subtitle to a 800 kb split from the same file (so the
 circumstances are the same), and tried to reencode it, the problem still
 occurs, so I think this will be good too, for reproducing!

 Also, I got the following message too:

 "Stream mapping:
   Stream #0:0 -> #0:0 (copy)
   Stream #0:1 -> #0:1 (copy)
   Stream #0:2 -> #0:2 (ass -> ass)
 Press [q] to stop, [?] for help
 [matroska @ 0x2d6f400] Encoder did not produce proper pts, making some up.
 Error while decoding stream #0:2
     Last message repeated 800 times
 frame=   90 fps=0.0 q=-1.0 Lsize=     690kB time=00:00:03.62
 bitrate=1558.2kbits/s
 video:518kB audio:59kB global headers:3kB muxing overhead 19.006394%"


 Error while decoding stream #0:2
 probably this is the important part, but I don't understand, because
 sometimes it doesn't writes this error (while testing with the file), and
 the encoded output is still incorrect! (so I think the Error message isn't
 always displayed)

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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1223#comment:5>
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